diff options
Diffstat (limited to 'opl/opl_linux.c')
-rw-r--r-- | opl/opl_linux.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/opl/opl_linux.c b/opl/opl_linux.c new file mode 100644 index 00000000..438b091a --- /dev/null +++ b/opl/opl_linux.c @@ -0,0 +1,79 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// Copyright(C) 2009 Simon Howard +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA +// 02111-1307, USA. +// +// DESCRIPTION: +// OPL Linux interface. +// +//----------------------------------------------------------------------------- + +#include "config.h" + +#ifdef HAVE_IOPERM + +#include <unistd.h> +#include <sys/io.h> + +#include "opl.h" +#include "opl_internal.h" + +static unsigned int opl_port_base; + +static void OPL_Linux_Init(unsigned int port_base) +{ + // Try to get permissions: + + if (ioperm(port_base, 2, 1) < 0) + { + return 0; + } + + opl_port_base = port_base; + + return 1; +} + +static void OPL_Linux_Shutdown(void) +{ + // Release permissions + + ioperm(opl_port_base, 2, 0); +} + +static unsigned int OPL_Linux_PortRead(opl_port_t port) +{ + return inb(opl_port_base + port); +} + +static void OPL_Linux_PortWrite(opl_port_t port, unsigned int value) +{ + outb(opl_port_base + port, value); +} + +opl_driver_t opl_linux_driver = +{ + "Linux", + OPL_Linux_Init, + OPL_Linux_Shutdown, + OPL_Linux_PortRead, + OPL_Linux_PortWrite +}; + +#endif /* #ifdef HAVE_IOPERM */ + |